Many years ago it was taught that plants and animals were composed of different materials: plants, of a chemical substance of three elements,- carbon, hydrogen, and oxygen; animals of one of four elements, nitrogen being added to the other three.

Quote by Asa Gray

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We may take it to be the accepted idea that the Mosaic books were not...

We may take it to be the accepted idea that the Mosaic books were not...

Next it was found that it was physiologically and structurally the same in the plant,...

Next it was found that it was physiologically and structurally the same in the plant,...

I accept extinction as best explaining disjoined species. I see that the same cause must...

I accept extinction as best explaining disjoined species. I see that the same cause must...

It was implicitly supposed that every living thing was distinctively plant or animal; that there...

It was implicitly supposed that every living thing was distinctively plant or animal; that there...

The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated...

The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated...

We have spoken of beings so low in the scale that the individuals throughout their...

We have spoken of beings so low in the scale that the individuals throughout their...

I know some people who never have any difficulties to speak of. The moment I...

I know some people who never have any difficulties to speak of. The moment I...

Indeed upon much that may have to say, I expect rather the charitable judgment than...

Indeed upon much that may have to say, I expect rather the charitable judgment than...

I am sufficiently convinced already that the members of a profession know their own calling...

I am sufficiently convinced already that the members of a profession know their own calling...

This substance, which is manifold in its forms and protean in its transformations, has, in...

This substance, which is manifold in its forms and protean in its transformations, has, in...

It remains to consider what attitude thoughtful men and Christian believers should take respecting them,...

It remains to consider what attitude thoughtful men and Christian believers should take respecting them,...

The former conviction that these two kingdoms were wholly different in structure, in function, and...

The former conviction that these two kingdoms were wholly different in structure, in function, and...

But it was soon ascertained that this quaternary matter of the animal body was chemically...

But it was soon ascertained that this quaternary matter of the animal body was chemically...

I proceed with the proper subject of this discourse; namely, the further changes in scientific...

I proceed with the proper subject of this discourse; namely, the further changes in scientific...

I take it for granted that you do not wish to hear an echo from...

I take it for granted that you do not wish to hear an echo from...

There is a class, moreover, by whom all these scientific theories, and more are held...

There is a class, moreover, by whom all these scientific theories, and more are held...

Why is it not just as likely that there were as many small general nearly...

Why is it not just as likely that there were as many small general nearly...

Is it philosophical, is it quite allowable, to assume without evidence from fossil plants that...

Is it philosophical, is it quite allowable, to assume without evidence from fossil plants that...

In short, the animal and vegetable lines, diverging widely above, join below in a loop.

In short, the animal and vegetable lines, diverging widely above, join below in a loop.

It was always understood that plants and animals, though completely contrasted in their higher representatives,...

It was always understood that plants and animals, though completely contrasted in their higher representatives,...